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1.
《Polyhedron》1987,6(2):285-288
Some new U(VI) and Ce(IV) complexes of 1-(2′-hydroxybenzyl)-2-(2′-hydroxyphenyl)-benzimidazole have been prepared and characterized by spectrg magnetic and conductance studies. IR spectral data suggests that the ligand in all the complexes is monodenate through the tertiary nitrogen and that the phenolic oxygen is free from coordination. Conductivity measurements indicate that the nitrate and acetate complexes of U(VI) are non-electrolytes, whereas the nitrate complex of Ce(IV) is a 1:1 electrolyte. 相似文献
2.
Abstract: A three step synthesis of the advanced glycosylation endproduct 2-(2′-furoyl)-4(5)-(2′-furanyl)-1H-imidazole (4, FFI) has been achieved from 2-acetylfuran. The key step in the synthesis was the rearrangement of the hydrazinium bromide 3 in refluxing methanol. 相似文献
3.
Krushna C. Satpathy Ashok K. Panda Rushabha Mishra Aditya P. Chopdar Sarada K. Pradhan 《Transition Metal Chemistry》1991,16(6):628-630
Summary Binuclear metal complexes of the type [M(HMTE)-(H2O)2]2, where HMTE=1-(-hydroxynaphthyl)-2-(3-methyl-5-mercapto-1,2,4-triazolc)2-aza-ethane and M-CuII, CoII, NiII and MnII have been prepared and characterized. An octahedral geometry around the metals is proposed. The complexes have been screened as possible fungicides. 相似文献
4.
1-(5′-溴-2′-吡啶基)-5-4′-硝基苯基)-3-(2′-呋喃基)甲(月朁)的合成及其与锌显色反应的研究 总被引:2,自引:0,他引:2
甲■类试剂是有色金属离子的优良显色剂。它们的各种取代衍生物,有许多作为分析试剂已被研究。近年来,为了改善该类试剂的分析性能,在甲(?)骨架上接上吡啶、噻唑、眯唑及呋喃等杂环基团,合成了一系列不对称型的杂环甲(?)。 本文报导5-Br-PNPFF试剂的合成和提纯方法。研究了它与锌显色反应的条件,用 相似文献
5.
A. B. Dobrynin P. I. Gryaznov O. E. Naumova I. A. Litvinov V. A. Alfonsov 《Journal of Structural Chemistry》2008,49(5):917-921
An X-ray study of (3Z)-(±)-4-(2′-hydroxypropyl)amino-and (3Z)-4-(2′-hydroxyethyl)amino-pent-3-en-2-ones is reported. The bond lengths inside the H ring are equalized due to the classical N-H...O hydrogen bond between the carbonyl oxygen and the amino group. In the 4-(2′-hydroxyethyl)amino-pent-3-en-2-one crystal, due to the classical N-H...O bonds, infinite zigzag chains are formed along the 0b axis and arranged into a layered structure due to the weak C-H...O interactions. In (±)-4-(2′-hydroxypropyl)aminopent-3-en-2-one crystal, however, centrosymmetric dimers are formed, which are then linked by weak C-H...O intermolecular interactions to form a layered structure along the a0b plane. 相似文献
6.
《合成通讯》2013,43(22):3913-3917
Abstract Aβ2,β3-homoproline derivative, (2S, 2′S)-3-phenyl-2-(pyrrolidin-2′-yl)propionic acid, was synthesized starting from l-proline. After preparation of the (4S, 4aS)-4-benzyl-4a,5,6,7-tetrahydro-pyrrolo-[1,2-c]pyrimidine-1,3-dione under a mild condition, the absolute configuration of target compound was assigned using 2D H-H COSY and H-H NOESY technologies. 相似文献
7.
E. V. Motorina T. N. Lomova P. A. Troshin M. V. Klyuev 《Russian Journal of General Chemistry》2014,84(5):946-952
Interaction between hydroxyoxo(5,10,15,20-tetraphenylporphyrinato)molybdenum(V) and 2′-(pyridin-4-yl)-5′-(pyridin-2-yl)-1′-(pyridin-2-yl)methylpyrrolidinyl[60]fullerene in toluene has been studied by means of spectrophotometry. The reaction proceeds via two stages: rapidly established equilibrium between the reactants and their molecular complex 1: 1 [K = (1.97 ± 0.52) × 104 L/mol] followed by slow irreversible displacement of hydroxy group into the second coordination sphere to form cationic outer sphere complex (k = 0.26 L s?1 mol?1). The effect of fullerene fragment on pyridine fragments coordination has been considered. 相似文献
8.
《Polymer Degradation and Stability》1986,14(3):263-284
A range of phenolic benzotriazolesulfonic acids containing a wide variety of substituents has been synthesized. These compounds protect wool to a significant extent against photo-tendering and, in some cases, against photo-yellowing. The protective effect is dependent on the nature and position of the substituents and is enhanced by (1) locating the sulfonic acid group distant from the hydrogen-bonded phenolic group and (2) placing bulky alkyl groups ortho to this phenolic group. The protective effect of one of the best photostabilizers (II) has been studied in detail and has been found to depend on both the concentration of the photostabilizer and the pH at which it is applied. The photostabilizer (II) also protects dyed wool to some extent against photo-fading as well as against phototendering. 相似文献
9.
邻羟基二苯甲酰基甲烷与Ac2O和HC(OEt)3反应通常是HC(OEt)3作为酰化剂,得到3-苯甲酰基色酮。本文报道5-甲氧羰基-2-羟基苯甲酰基-(2′-甲氧苯甲酰基)甲烷与Ac2O和HC(OEt)3反应时,是Ac2O而不是HC(OEt)3作为酰化剂,生成3-苯甲酰基-2-甲基色酮。其结构经NMR、MS、IR和EA证实。并对其反应机理作了讨论。 相似文献
10.
An unsaturated 2-methoxy-substituted 1-O-alkylglycerol, (Z)-(2′R)-1-O-(2′-methoxynonadec-10′-enyl)-sn-glycerol, a new analog of bioactive ether lipids, was synthesized from oleic acid and 2,3-isopropylidene-sn-glycerol. The two key steps of this synthesis were the conversion of oleyl aldehyde to a monounsaturated epoxide using Matteson’s method followed by hydrolytic kinetic resolution and a nucleophilic epoxide opening by 2,3-isopropylidene-sn-glycerol in the presence of potassium tert-butoxide in anhydrous DMF, which appeared to be a good reagent for this purpose. Furthermore, the diol by-product of the HKR process was also easily converted back to the starting epoxide thus almost doubling the amount of target molecule. 相似文献
11.
设计并合成了2-(2′-羟基-3′-甲氧基苯基)-5,6-二硝基苯并咪唑化合物(1),通过X射线单晶衍射研究了该化合物的固态结构.利用紫外-可见光谱技术研究了其对阴离子的识别,发现化合物1能够在DMSO中对AcO-,H2PO4-,OH-的3种离子进行有效识别,同时溶液由原来的黄色变成红色,实现裸眼检测. 相似文献
12.
用 Philips PW-1100型单晶衍射仪收集了2-(2′-噻唑偶氮)-5-二乙胺基酚晶体的三维衍射数据.应用最小函数法和直接法测定了晶体结构.在衍射仪上测得晶胞常数 a=20. 018(±0. 005),b=8. 894(±0. 03) (?),c=7. 658(±0. 002) ,z=4. 空间群为P2_12_12_1. 原子的坐标参数、温度因子参数及非氢原子的各向异性温度因子参数一起进行了全矩阵最小二乘修正,最后 R 因子为0. 072,加权以后 R_W 为0. 051. 晶体结构分析结果表明:二乙胺基有效地参与了共轭体系,使二乙胺基的强助色性能得到了很好的解释. 相似文献
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14.
《Journal of Coordination Chemistry》2012,65(22):3703-3710
Two new 2D Pb2(μ-4,4′-bipy)(μ-2-sb)2 coordination polymers, [Pb2(μ-4,4′-bipy)(μ-2-sb)2(DMF)] n (1) and {[Pb2(μ-4,4′-bipy)(μ-2-sb)2(H2O)2] · H2O} n (2), have been synthesized, characterized and studied by X-ray crystallography. The structural studies show the Pb atoms to have seven- and eight-coordinate holodirected geometries. 相似文献
15.
P. Knoth 《Monatshefte für Chemie / Chemical Monthly》1955,86(2):210-215
Zusammenfassung Im Anschluß an kürzlich erschienene Arbeiten über Synthesen von 3-(N-Methyl-2-piperidyl)-chinolizidin, einer Verbindung von der gleichen Struktur wie sie dem Alkaloid Pusillin zukommen soll, wird über eine eigene Synthese zweier stereoisomerer Verbindungen dieser Konstitution berichtet. 相似文献
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17.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1988,44(8):835-838
2-(4′-methyl-2′-thiazolylazo)-4,6-dimethylphenol has been synthesized and its acid—base behaviour (pKa1=0.03 ± 0.01, pKa2=9.70±0.09) and complexation equilibria with zinc (logβ101=6.70±0.04, logβ102 = 13.70±0.02) studied in a 40% (v / v) ethanol—water medium at I=0.25 M NaClO4. A spectrophotometric method for the determination of 0.2–1.5 ppm of zinc has been developed (ε=1.83 × 104 1. mol−1 cm−1 at 590 nm) and applied to its determination in lubricating oils. 相似文献
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A. V. Aksenov O. N. Nadein I. V. Borovlev Yu. I. Smushkevich 《Chemistry of Heterocyclic Compounds》1998,34(3):316-320
A method was developed for the synthesis of 2-alkyl(aryl)-1,2-dihydro-2,3-biquinolines, based on the addition of organolithium compounds to 2,3-biquinoline in the presence of tetramethylethylenediamine. Their oxidation with manganese dioxide led to 2-alkyl(aryl)-2,3-biquinolines.For Communication 2, see [1].Stavropol State University, Stavropol 355009, Russia. Russian Chemical-Technology University, Moscow 125190. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 350–354, March, 1998. 相似文献
20.
《Journal of Coordination Chemistry》2012,65(14):2535-2548
Starting from cis-[Ru(dcbpyH2)2Cl2] (1), two new heteroleptic ruthenium(II) complexes, [Ru(dcbpyH2)2(L1)](NO3)2 (L1?=?2-(2′-pyridyl)quinoxaline (2), and [Ru(dcbpyH2)2(L2)](NO3)2 (L2?=?4-carboxy-2-(2′-pyridyl)quinoline (4); dcbpyH2?=?2,2′-bipyridine-4,4′-dicarboxylic acid), were synthesized and spectroscopically characterized. During the preparation of 2 and 4, the homoleptic [Ru(dcbpyH2)3]Cl2 complex (3) was isolated as a side product. Characterization includes IR and Raman spectroscopy, UV-Vis, multinuclear NMR spectroscopy, elemental, and ESI-mass spectrometric analyses. 相似文献